Gas-cap for arc-lamps.



' E. n. Banen.

GAS AP FOB ARC LAIPS. Appumm and 1.11901.)

(In Inkl.)

772? Army/vers l 'l UNITED' STATES- ;'PnTnNi-i Queres. f"

- EDWARD n. n-ELDEN, or DAY'roN, omo.

` GAS-CAP Fon Anc-LAMPs. h.

SPECIFICATION forming part of Letters Patent No. 710,659, Med October 7, IQO.

l Applloltlogled (.)o :bar 7. 1901. Serial Ho. 77.810. (No model.)

To all whom, may concern:

Beit known that I, EDWARD Il. BELDEN, a

citizen of the United States, residing at Dayton, in the State of Ohio,have invented certain 5 new and useful Improvements in Gas-Caps for ArcLamps; and l do hereby declare that the following is a full, clear. and exact description of the invention, which will enable others skilled. in the art to which it appertans to make and use the same, reference being had tothe accompanying drawings, which form part of this specification.

My invention relates to improvements in provide an improved gas-cap for closing the top of the arc-chamber of an arc-lamp hav'- ing an improved means for insulating the .movable carbon and its containing-tube from the said cap through which itpasses and 'adapted to admit of such expansion and contraction as is incident to service without the usual liability of breakage and so mounted in said cap as to be readily removed or re- :5 placed when desired. j

My invention consists of a circular metal- .lic plate having an upright annular flange adapted to embrace the lower open end of the clutch-chamber casting in a well-under 3o 'stood manner, having upon its lower f ace the usual' pendent concentric anges adapted to,

collect and retain the insoluble products of combustion of the arc-chamber, and having a centrally-arranged and loosely-seated insu- 5, 5 loting-plug having a central opening for the movable carbon.

The novel feature of my improvement resides in the removable and loosely-mounted Ineens for insulating themovable carbon from the gas-cep through which it passes.

Similarrei'erence-numerals in the accompa nyingdrawings indicate like parts throughout the several views, in which Figure 1 is a perspective plan of my improved cap in positionyon the inner globe of the lamp broken away and showing the removeble insulating plug in position and showing the means for securing the same. Fig. 2 is a bottom plan of the same with the truding fece or the send'plug. Fig. 3 is a. perspective deteil of theseid insulatingplug,

The object of my present invention is to,v

inner globe omitted, showing the lower pro showing the beveled annular face on which it rents when seated in position. Fig. 4 is a cross-sectional thefcap, taken on the lino n' :u of Fig. 2, with the carbonln-acket omitted and with the said insulating-plug broken away in part to show the beveled sont mr which the said plug rests.4

My improved gas-cap 1` of suitable metal, has an upright peripheral flange 2, adapted to snugly lit over the bottom of the clutchchamber casting of the lamp,(not shown,) and has two opposite insulated openings, in which the upper ends of the carbonhracket43 are 654 rigidlysecnred. These bracket ende areelec` Y 1 tricallyconnected fby means of the curved plate 4. .A At diametric points on the-outer face of the said, flange 2 are arranged proper ears or lugs 5, to wlich'the upper ends of the inner globe-bracket G are pivotally secured. The lower face of said cap 1 has a plurality,

preferably two *lf-Pendenti concentric'iianges l 7 and 8, adapted to receive, collect, and rctain the insoluble products of combustion in the nrc-chamber i a well-understood mmv ner. This gas-e: g is also provided withva .Y central opening havinga beveled or inclined face 9, Fig. 4, adapted to support the said insulating-plug. In this central opening is. loosely mounted my improved insulating device or plug 1I), of porcelain, lavaor 'other proper insulating material, and adapted tobeA e loosely mounted in said central'y opening, having a central vertical opening 11, in which 85 the movable carbon (not shown) is loosely arranged, and provided with a. beveled face 12, adapted to' rest upon the said beveled seat 9 ofthe cap 1. This insulating-plug is of one solid piece and -is therefore not liable 9o to be cracked and broken by the heat of the lamp, has a sucient length or thickness to properly guide the movable carbon, and is secured in position by means of the holdingscrews 13 and the metallic washers 14, whose 95 inner and overlapping edges form abindng engagement with the adjacent face of the said plu". f A

I t is obvious that my improved insulatingplug l0V thus mounted in position secures a roo perfect insulation of the movable Acarbon und its containing-tube -from the said .gascap, that as it is loosely mounted on its tapering seat it will admit of such expansion wf'Y -vlor contraction as is incident to use without anyfstrain thereon and without danger of breaking, andfthatas the said ping is se-4 cured inpositin -onlyby its tapering seat and the two overlapping washers 14 it can readily and conveniently be removed or rcplaced at pleasure by the simple removal o f -the two holdingscrews 13.

Having thus described my invention' and the manner of employing the same, what I desire to secure by Letters Patent is.

A gas-capfor the mc-chmber of an arclamp consisting of a. disk having an upright peripheral flange and one or more pendent 15 iienges for the purposes specied, and having a central vertical opening provided with a. conical o r spherically concave seat for an insulating-plug, in combination with a plug orblock of porcelain or other insulating mls- 

